 |
| Titel |
Effects of aerosols on precipitation in north-eastern North America |
| VerfasserIn |
R. Mashayekhi, J. J. Sloan |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 10 ; Nr. 14, no. 10 (2014-05-26), S.5111-5125 |
| Datensatznummer |
250118734
|
| Publikation (Nr.) |
 copernicus.org/acp-14-5111-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| The changes in precipitation in north-eastern North America caused by
chemistry – and particularly anthropogenic aerosols – are investigated
using the Weather Research Forecasting with Chemistry (WRF/Chem v3.2) model. The simulations were carried out for a five-month
period from April to August 2009. The model results show that non-negligible
changes in both convective and cloud-resolved (non-convective) precipitation
are caused by chemistry and/or aerosols over most parts of the domain. The
changes can be attributed to both radiative and microphysical interactions
with the meteorology. A chemistry-induced change of approximately −15%
is found in the five-month mean daily convective precipitation over areas
with high convective rain; most of this can be traced to radiative effects.
Total convective rain is greater than total non-convective rain in the
domain, but a chemistry-induced increase of about 30% is evident in
the five-month mean daily non-convective precipitation over the heavily
urbanized parts of the Atlantic coast. The effects of aerosols on cloud
microphysics and precipitation were examined for two particle size ranges, 0.039–0.1 μm and 1–2.5 μm, representing the nucleation and
accumulation modes respectively. Strongly positive spatial correlation
between cloud droplet number and non-convective rain are found for activated
(cloud-borne) aerosols in both size ranges. Non-activated (interstitial)
aerosols have a positive correlation with cloud droplet number and
non-convective rain when they are small and an inverse correlation for
larger sizes. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|